1、so... that【这个短语一般分开写,表明中间需要加词】。 如此…以致于;太……以至于
This is so interesting a book that I am interested by it.
这本书如此有趣以致于我的兴趣都被激发了。
The boy is so young that he can't go to school.
=The boy is too young to go to school.
转换条件:【只有当so...that 结构中用否定形式时,才能够替换为too...to结构】。
这个男孩太小了还不能上学。
2、too ...to 太...而不能...;很,非常,极其,相当。
I am too tired to go any further.我太累了再也走不动了。
=I am so tired that I can't go any further.
【特别注意】:当 too...to 结构中,如果所用的形容词表示积极、正面意义时,该结构不表示否定意义,而表示【很,非常,极其,相当】,这时,它【与so...that结构不能替换】。
I am 【too =so;very】pleased to help you.我非常高兴帮助你。
3、enough to do:足以...
Blair was kind enough to do some research.
=Blair was so kind that he did some research.【这两种结构替换,必须是“肯定句”】。
Tim is 【not old enough to】 go dancing.
=Tim is【 too young to 】go dancing.
=Tim is 【so young that 】he 【can't 】go dancing.这些替换条件都包含在句子中。
祝你学习进步,时时开心!O(∩_∩)O~~
追问The old man is so old that he can't work . = The old man is too old to work . 还等于The old man is not young enough to work .吗?
追答The old man is so old that he can't work . = The old man is too old to work .
还等于The old man is not【最好加so/that】 young enough to work .
看来,你确实理解了他们的关系!这些替换基本上都成立!祝贺你弄懂了,会用了!!